TestSupport already defines a logger:

https://github.com/sonatype/sisu-litmus/blob/e79e033317f9329daaee929bce3e181aecfb5d79/litmus-testsupport/src/main/java/org/sonatype/sisu/litmus/testsupport/TestSupport.java#L37

I'd use that instead of redefining a new one.  And/or use the log() helpers.